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Topic: Step-wise ionization of all three carboxyl groups of citric acid  (Read 10617 times)

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jennabear

  • Guest
Step-wise ionization of all three carboxyl groups of citric acid
« on: September 25, 2004, 07:03:59 PM »
Hi, could you please help me with this question? I am supposed to write an equation to represent the step-wise ionization of all three carboxyl groups of citric acid, but I just can't get it to work.  Please *delete me*
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Demotivator

  • Guest
Re:Step-wise ionization of all three carboxyl groups of citric acid
« Reply #1 on: September 25, 2004, 07:13:29 PM »
Can you post the formula/struture of citric acid?
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jennabear

  • Guest
Re:Step-wise ionization of all three carboxyl groups of citric acid
« Reply #2 on: September 25, 2004, 07:23:43 PM »
       H
    H-C-COOH
  HO-C-COOH
    H-C-COOH
       H
 Hope this helps
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Demotivator

  • Guest
Re:Step-wise ionization of all three carboxyl groups of citric acid
« Reply #3 on: September 25, 2004, 07:40:41 PM »
Ok, the carboxyl groups, COOH (represented as CO2H  below) have the acidic  H, So,

R(CO2H)3  -> R(CO2H)2(CO2)-  +  H+  1st ionization
 R(CO2H)2(CO2)-  -> R(CO2H)(CO2)22-  +  H+   2nd
 R(CO2H)(CO2)22-  ->   R(CO2)33-  +  H+     3rd
 
Where I used R to represent the rest of the molecule, ie
R is C3H5O  
« Last Edit: September 25, 2004, 07:45:18 PM by Demotivator »
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jennabear

  • Guest
Re:Step-wise ionization of all three carboxyl groups of citric acid
« Reply #4 on: September 25, 2004, 07:52:36 PM »
Thank you soooo much!!!!!!!!!!
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Demotivator

  • Guest
Re:Step-wise ionization of all three carboxyl groups of citric acid
« Reply #5 on: September 25, 2004, 07:55:41 PM »
Look at it again because I fixed a few subscripts I missed . I don't know if you caught it.
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